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uuChecking and Maintaining Tires uDOT Tire Quality Grading (U.S. Vehicles)
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Maintenance
DOT Tire Quality Grading (U.S. Vehicles)
The tires on your vehicle m eet all U.S. Federal Safety Requirements. All tires
Quality grades can be found where applicable on the tire sidewall between tread
shoulder and maximum section width.
The treadwear grade is a comparative rating based on the wear rate of the tire
when tested un der controlled conditions on a specified government test course.
For example, a tire graded 150 would wear one and one-half (1 1/2) times as well
depends upon the actual co nditions of their use, however, and may depart
significantly from the norm due to variations in driving habits, service practices
and differences in road characteristics and climate.
■Uniform Tire Quality Grading
■Treadwear
1Uniform Tire Quality Grading
For example:
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform to
Federal Safety Requirements in addition to
these grades.
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are also graded for treadwear, traction, and temperature performance according
to Departm en t o f Transportation (DOT) standards. The following explains these
gradings.
o n t he gove rnment course as a tire graded 100. T he r ela tive per formance of tires
